ALEX PLUS All Purpose Acrylic Latex Caulk Plus Silicone A superior quality, all-purpose acrylic latex caulk plus silicone that is is highly flexible, durable, and has excellent adhesion to create a long lasting waterproof seal. FEATURES AND BENEFITS​ Lifetime guarantee. Meets ASTM C920, Class 25. Exterior/interior use. 100% waterproof & weatherproof. 30 minute rain ready. Wet/damp surface adhesion. Excellent flexibility & adhesion. Low odor. Shrink & crack proof. Cured sealant is mold & mildew resistant. Back to DAP